How to disable html mail composition in Thunderbird

Send plain text messages

  • Uncheck Tools -> Account Settings -> Composition & Addressing -> Compose messages in HTML format for each account.
  • If it sometimes wants to reply in HTML add *.* as the domain name in Tools -> Options -> Composition -> Send Options -> Plain Text Domains if you want to force it to always send using plain text.

Source:
http://kb.mozillazine.org/

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